The results of high precision weak neutral current (WNC), Z‐pole, and high energy collider
electroweak experiments have been the primary prediction and test of electroweak unification. The electroweak program is briefly reviewed from a historical perspective. Current changes, anomalies, and things to watch are summarized, and the implications for the standard model and beyond discussed.

From the famous experiments of Stern and Gerlach to the present, measurements of magnetic dipole moments, and searches for electric dipole moments of “elementary” particles have played a major role in our understanding of sub‐atomic physics. In this talk I discuss the progress on measurements and theory of the magnetic dipole moments of the electron and muon. I also discuss a new proposal to search for a permanent electric dipole moment (EDM) of the muon and put it into the more general context of other EDM searches.

Electron Scattering from nucleons and light mesons has provides precise information about the ground state
structure of matter. In this talk I present a survey of recent experimental progress on the electromagnetic and weak structure of nucleons as well as the structure of pions and kaons.

In this talk I discuss recent advances in Quantum Chromo‐Dynamics, in particular the progress in understanding the collective dynamics of the theory. I emphasise the significance of the RHIC program for establishing the properties of hot and dense QCD matter and for understanding the dynamics of the theory at the high parton density, strong color field frontier. Hopes and expectations for the future are discussed as well.

My presentation will focus on some of the latest results of the neutron spin physics program at Jefferson Laboratory in Hall A using a polarized 3He target. This program includes several completed experiments in which the spin structure functions of 3He were measured. The covered kinematic regions were these measurements were performed include the low Q2 resonance and inelastic regions and the high Q2 deep inelastic region. These experiments offer a ground for testing our understanding of the strong regime of quantum chromodynamics
(QCD) through the determination of the neutron spin‐dependent structure functions and their moments.

Experiment E158 has recently observed parity violation in the scattering of polarized electrons from the electrons in a liquid hydrogen target at SLAC. The results are consistent with the predictions of the Standard Model. We plan to obtain additional data by the end of the summer of 2003 to provide the most precise measurement of sin2 θW at low energy.

I discuss the theoretical implications of the WMAP results, stressing WMAP’s detection of a correlation between the E‐mode polarization and temperature anisotropies, which provides strong support for the overall inflationary paradigm. I point out that almost all inflationary models have a “vanilla limit,” where their parameters cannot be distinguished from a genuinely de Sitter inflationary phase. Because its findings are consistent with vanilla inflation, WMAP cannot exclude entire classes of inflationary models. Finally, I summarize hints in the current dataset that the CMB contains relics of new physics, and the possibility that we can use observational data to reconstruct the inflaton potential.

The KLOE experiment at DAΦNE collected about 450 pb−1 of data in 2001–2002. Much of this data set has been analyzed and has yielded definitive results on KS and radiative φ decays, as well as studies concerning a wide range of topics in kaon and hadronic physics.

I describe the future accelerator facilities that are currently foreseen for electroweak scale physics, neutrino physics, and nuclear structure. I will explore the physics justification for these machines, and suggest how the case for future accelerators can be made.

The NuTeV experiment at Fermilab obtained pure high statistics samples of neutrino and antineutrino interactions using its sign‐selected beam. Preliminary inclusive charged current differential cross sections of neutrino and antineutrino interactions on iron are presented, along with preliminary measurements of F2(x, Q2) and xF3(x, Q2). Preliminary results from the next‐to‐leading order QCD
analysis of deep inelastic charged current dimuon data are also shown.

The Fermilab E866/NuSea Collaboration has measured the Drell‐Yan dimuon cross sections in 800 GeV/c proton‐proton and proton‐deuterium collisions. This is the first measurement of the absolute Drell‐Yan cross section in proton‐proton collisions over a broad kinematic region and the most extensive study to date of the Drell‐Yan cross section in proton‐deuterium collisions. The Drell‐Yan mechanism is sensitive to both the beam and target parton distributions. In particular, with the kinematics of the E866/NuSea data, the Drell‐Yan mechanism is sensitive to the target antiquark distributions at low and intermediate Bjorken‐x and to the beam quark distributions at high‐x. Approximately 55K proton‐proton and 121K proton‐deuterium Drell‐Yan events over the longitudinal momentum fraction (Feynman‐x) range −0.05 < xF < 0.8 and the mass ranges 4.2 < Mμ+μ− < 8.7 GeV and 10.85 < M < 16.85 GeV are included. The data analysis will be described, and the doubly‐differential M3d2σ/dMdxF, and triply‐differential cross sections Ed3σ/dp3 will be presented. These results will be compared with previous measurements by E605 and E772 and to predictions based upon next‐to‐leading order calculations utilizing the MRST2001 and CTEQ6 global parton distribution function fits. The results indicate that recent global parton distribution fits provide a good description of the light antiquark sea in the nucleon over the Bjorken‐x range 0.03 < x < 0.15. In contrast, the valence quark distributions appear to be overestimated by the current parton distribution fits as x → 1; a region in which, prior to this data, there was very little proton data to constrain the global fits.

Results from QCD studies at the Tevatron from new Run 2 data are presented. The inclusive jet cross section and dijet mass spectrum are measured at
by the CDF and DO/ collaborations. CDF also reports results of searches for new particles decaying into dijets, and a study of jet shapes.

Results on soft and hard diffraction obtained by the CDF Collaboration at the Fermilab Tevatron p̄pCollider are reviewed with emphasis on aspects of the data that point to the underlying QCD mechanism for diffraction. The results are interpreted in terms of a phenomenological approach in which diffraction is due to an exchange of low‐x partons subject to color constraints.

We have studied the production of fast neutrons and protons in proton
positron collisions at the HERA collider. Results from experiments ZEUS and H1 are presented. Special detectors were used by the two experiments to detect particles emerging very close to the beam. The results support the assumption of vertex factorization. Measurements of the F2 structure function was made as well as the pion structure function
. Both of these structure functions behave as the electron proton
F2 structure function.

Exclusive coherent and incoherent electroproduction of the ρ0meson from 1H and 14N targets has been studied at the HERMES experiment as a function of coherence length (lc), corresponding to the lifetime of hadronic fluctuations of the virtual photon, and squared four‐momentum of the virtual photon (−Q2). The ratio of 14N to 1H cross sections per nucleon,called nuclear transparency, was found to increase (decrease) with increasing coherence length for coherent (incoherent) ρ0 electroproduction. For fixed coherence length, a rise of nuclear transparency with Q2 is observed for both coherent and incoherent ρ0 production, which is in agreement with theoretical calculations of color transparency.

The HERMES experiment studies the spin structure of the nucleon using the 27.6 GeV longitudinally polarized positron beam of HERA and internal targets of pure gases. Recently, HERMES has published measurements of azimuthal single‐spin asymmetries in the hard electroproduction of photons on an unpolarized hydrogen target arising from the interference of the amplitudes of the Bethe‐Heitler (BH) and the Deeply Virtual Compton Scattering (DVCS) processes. The measurements constitute an effort towards accessing generalized parton distributions, and open a new approach to study the spin structure of the nucleon.

Generalized parton distributions provide a unifying framework for the interpretation of exclusive reactions at high Q2. The most promising reaction for the investigation of these distributions is the hard production of photons using Deeply Virtual Compton Scattering (DVCS). This reaction can be accessed experimentally by determining the production asymmetry using polarized electrons on a proton target. Pioneering experiments with CLAS and HERMES have produced the first measurements of this asymmetry. We will review the current experimental program to study DVCS at Jefferson Lab. Recent high statistics data taken with CLAS at 5.75 GeV allows us to determine this asymmetry at low −t in the valence region (xB=0.1–0.5) up to a Q2 of 4 GeV2/c2.

The DIRAC experiment at CERN is presently measuring the lifetime of the pionium atom, a bound state of a π+ and π−meson. The isospin 0 and 2 scattering length difference will be determined unambiguously once the value of the lifetime is known. In what follows we describe the present status of the experiment, the experimental goals and the first results.